package cn.itcast.netty.c1;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;

/**
 * @Author: LDeng
 * @Date: 2021-05-17 13:43
 */
public class HelloServer {
    public static void main(String[] args) {
        //1, 启动器，负责组装netty组件，启动服务器
        new ServerBootstrap()
                //2， BossEventLoop,WorderEventLoop(包含selector,thread)
                .group(new NioEventLoopGroup())
                //3, 选择服务器的ServerSocketChannel实现
                .channel(NioServerSocketChannel.class)
                .childHandler( //4， boss 负责处理连接， worker(child)负责处理读写，决定child能执行哪些操作（handler）
                        //5, channel代表和客户端进行数据读写的通道 Initalizer 初始化器，负责添加别的handler
                        new ChannelInitializer<NioSocketChannel>() {
                            @Override//连接建立后才会被调用
                            protected void initChannel(NioSocketChannel ch) throws Exception {
                                //6， 添加具体handler
                                ch.pipeline().addLast(new StringDecoder());//将ByteBuf转换为字符串
                                ch.pipeline().addLast(new ChannelInboundHandlerAdapter() {//自定义handler
                                    @Override// 读事件
                                    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                                        //打印上一步转换好的字符串
                                        System.out.println(msg);
                                    }
                                });
                            }
                        })
                .bind(8080);//7 ，监听端口

    }
}
